They are in the .lib file for the device family you're targeting, from pbppic14.lib for example:
Code:
;****************************************************************
;* MOVE?WW    : Macro - Move WORD variable into WORD variable   *
;*                                                              *
;* Input      : Win = WORD variable                             *
;* Output     : Wout = WORD variable                            *
;*                                                              *
;* Notes      :                                                 *
;****************************************************************

MOVE?WW macro Win, Wout
        MOVE?BB Win, Wout
        MOVE?BB (Win) + 1, (Wout) + 1
    endm
Hope that's helpful....

/Henrik.